function hiliteNav(obj) {
	objName = document.getElementById(obj);
	objClass = obj + '_on';
	objName.className = objClass;
	if (obj=='enwave' || obj=='bio' || obj=='chiro' || obj=='guide') {
			subObj = obj + '_sub';
			subName = document.getElementById(subObj) ;
			subClass = obj + '_sub_on';
			subName.className = subClass;
	}
}